# -*- coding: utf-8 -*-#
#-------------------------------------------------------------------------------
# 建立者:        Young  
# Name:         demo2.01
# Description:
# Author:       $赵怡蕾
# Date:         2019/1/17
#-------------------------------------------------------------------------------

print("import和from...import...演示")

# 导入math模块
import math
print(math.floor(20.6))

# 导入math模块中的sqrt函数
from math import sqrt
print(sqrt(12))

# 导入math模块中的所有函数
from math import *
print(sin(3.14/2))